多孔表面推迟高超声速边界层转捩的机理

计算物理 ›› 2016, Vol. 33 ›› Issue (2): 163-169.

多孔表面推迟高超声速边界层转捩的机理

朱德华, 刘智勇, 袁湘江

中国航天空气动力技术研究院, 北京 100074

收稿日期:2015-02-12 修回日期:2015-06-03 出版日期:2016-03-25 发布日期:2016-03-25
作者简介:朱德华(1982-),男,黑龙江人,工程师,博士,主要从事高超声速湍流以及流动稳定性研究,E-mail:zhu-dh02@126.com

Mechanism of Transition Delay by Porous Surface in Hypersonic Boundary Layers

ZHU Dehua, LIU Zhiyong, YUAN Xiangjiang

China Academy of Aerospace Aerodynamics, Beijing 100074, China

Received:2015-02-12 Revised:2015-06-03 Online:2016-03-25 Published:2016-03-25

摘要/Abstract

摘要： 利用线性稳定性理论分析（LST）结合直接数值模拟（DNS）研究高超声速多孔表面边界层流动的失稳特征，分析多孔表面推迟高超声速边界层转捩的机理.在Ma=6，Re=2.0×10⁴（参考长度为入口处边界层位移厚度）条件下获得平板边界层及不同孔隙排列情形下平板边界层的典型流动特征，并采用LST方法分析光滑平板及多孔平板扰动的增长率及累计放大率.研究表明三维顺排及错排多孔表面都可以抑制第二模扰动的发展，推迟高超声速边界层转捩，但顺排多孔表面推迟高超声速边界层转捩能力更强.

关键词: 多孔表面, 直接数值模拟, 线性稳定性, 高超声速

Abstract: Mechanism of transition delay by porous surface in hypersonic boundary layers is investigated. Linear stability theory (LST) is adopted to analyze characteristics of instability and comparisons with direct numerical simulation (DNS) are made. Under conditions Ma=6.0,Re=2.0×10⁴ (length scaled by displacement thickness of boundary layer),typical flow characteristics are obtained for planar boundary layers with and without distributed pores. Disturbing growth rate of smooth and porous boundary layers are computed by LST. N-factor,which is regarded as a symbol of accumulated growing of disturbance,is calculated. It shows that pores prohibit growth of Mack's mode and therefore delay transition of hypersonic boundary layer. Sequence-distributed pores stabilize boundary-layer flow more effectively than interlace-distributed pores.

Key words: porous, direct numerical simulation, linear stability analysis, hypersonic

中图分类号:

O354.4

朱德华, 刘智勇, 袁湘江. 多孔表面推迟高超声速边界层转捩的机理[J]. 计算物理, 2016, 33(2): 163-169.

ZHU Dehua, LIU Zhiyong, YUAN Xiangjiang. Mechanism of Transition Delay by Porous Surface in Hypersonic Boundary Layers[J]. CHINESE JOURNAL OF COMPUTATIONAL PHYSICS, 2016, 33(2): 163-169.

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